/*
 * Copyright 2012 Finbudget.com
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package finbudgettable.client.ui.grid.cell.currency;

import finbudget.client.ui.table.Record;

import java.math.BigDecimal;
import java.util.Comparator;

/**
 * Currency field comparator. Null values go first in an ascending order.
 */
public class CurrencyComparator implements Comparator<Record> {

    private final String fieldName;

    public CurrencyComparator(String fieldName) {
        this.fieldName = fieldName;
    }

    @Override
    public int compare(Record o1, Record o2) {
        BigDecimal value1 = o1.getValueBigDecimal(fieldName);
        BigDecimal value2 = o2.getValueBigDecimal(fieldName);
        if (value1 == null && value2 == null) {
            return 0;
        }
        if (value1 == null) {
            return -1;
        }
        if (value2 == null) {
            return 1;
        }
        return value1.compareTo(value2);
    }
}
